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I saw interesting things about world, now I understand that people want more from something, no matter what they get, they always want more.

For example, if they have a good job, so the job will be good job for a while, but not foverer, because in the short time, they will not think the job is good, very soon the will blame the job, and in future a better job will be a better job for short time, than will down for a good job, and so on.

I think it is because the evolution, evolution pull all of us in this situation.

We always want more from something, and something can be anything else you want, not matter what.